/* 先在項目中導入AVFoundation.framework框架 */ #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface QRViewController : UIViewController {/*** AVCaptureSession：AVFoundation中的核心類，用于通過硬件獲取、處理和輸出視頻。一個Capture Session由多個輸入和多個輸出組成，并控制輸出幀的格式和分辨率。AVCaptureVideoPreviewLayer：用于顯示攝像頭捕捉到得視頻到UI。*/AVCaptureSession *_captureSession;AVCaptureVideoPreviewLayer *_previewLayer; }#import "QRViewController.h" #define Width self.view.frame.size.width #define Height self.view.frame.size.height @interface QRViewController ()<AVCaptureMetadataOutputObjectsDelegate> {int num;BOOL upOrdown;NSTimer *timer;//自定義界面UIImageView *imageView;UIButton *scanButton;UILabel *labIntroudction;UIImageView *line; } @end@implementation QRViewController- (void)viewDidLoad {[super viewDidLoad];_previewLayer.frame = self.view.frame;[self initWith];[self setupCaptureSession];[self.view addSubview:scanButton];[self.view addSubview:labIntroudction];[self.view addSubview:imageView];upOrdown = NO;num =0;timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation) userInfo:nil repeats:YES];}//自定義界面- (void)initWith {scanButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];[scanButton setTitle:@"取消" forState:UIControlStateNormal];scanButton.frame = CGRectMake(50, Height - 200, Width - 100, 50);scanButton.backgroundColor = [[UIColor blackColor]colorWithAlphaComponent:0.5];[scanButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake(50, 100, Width - 100, 50)];labIntroudction.numberOfLines = 0;labIntroudction.textColor=[UIColor whiteColor];labIntroudction.text=@"將二維碼圖像置于矩形方框內，離手機攝像頭10CM左右，系統會自動識別。";labIntroudction.font = [UIFont systemFontOfSize:16.0];labIntroudction.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pick_bg.png"]];imageView.frame = CGRectMake(40, 170, Width - 80, Width - 80);_line = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, imageView.frame.size.width - 20, 2)];_line.image = [UIImage imageNamed:@"line.png"];[imageView addSubview:_line];self.view.backgroundColor = [UIColor clearColor];}-(void)animation {if (upOrdown == NO) {num ++;_line.frame = CGRectMake(10, 10 + 2*num, imageView.frame.size.width - 20, 2);if (2*num == CGRectGetHeight(imageView.frame) - 20) {upOrdown = YES;}}else {num --;_line.frame = CGRectMake(10, 10 + 2*num, imageView.frame.size.width - 20, 2);if (num == 0) {upOrdown = NO;}}} -(void)backAction {[self dismissViewControllerAnimated:YES completion:^{[timer invalidate];}]; }/*** 這個方法用于建立capture session。如果session已經存在，則直接返回。初始化video device，若設備沒有攝像頭，則直接返回。初始化capture session。通過video device創建video input。查詢session是否接受一個輸入，如果接受，添加輸入到session中。最后，創建預覽層并為其指定要預覽的capture session。*/ - (void)setupCaptureSession {if (_captureSession) return;/*AVCaptureDevice：封裝設備上的物理攝像頭。對iPhone而言有前后兩個攝像頭。AVCaptureDeviceInput：要添加一個AVCaptureDevice到session中，需要用AVCaptureDeviceInput來包裹一下。*/// 首先我們應該判斷當前設備是否有捕獲數據流的設備。AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];if (!videoDevice) {NSLog(@"No video camera on this device!");return;}AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];//初始化一個 CaptureSession對象_captureSession = [[AVCaptureSession alloc] init];//設置會話的輸入設備if ([_captureSession canAddInput:input]){[_captureSession addInput:input];}//對應輸出AVCaptureMetadataOutput *captureMetadataOutput = [[ AVCaptureMetadataOutput alloc] init];[_captureSession addOutput:captureMetadataOutput];//設置掃描區域[captureMetadataOutput setRectOfInterest:CGRectMake(imageView.frame.origin.y/ Height ,imageView.frame.origin.x/ Width , imageView.frame.size.width / Height, imageView.frame.size.height / Width)];//創建一個隊列dispatch_queue_t metadataQueue = dispatch_queue_create("myQueue", 0);[captureMetadataOutput setMetadataObjectsDelegate:self queue:metadataQueue];[captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]];if([_captureSession canAddOutput:captureMetadataOutput]){[_captureSession addOutput:captureMetadataOutput];}// 降捕獲的數據流展現出來_previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];_previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;[_previewLayer setFrame:self.view.layer.bounds];[self.view.layer addSublayer:_previewLayer];// 開始捕獲[ _captureSession startRunning];}- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {// 判斷是否有數據，是否是二維碼數據if (metadataObjects != nil && [metadataObjects count] > 0) {AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];//獲得掃描的數據，并結束掃描[self dismissViewControllerAnimated:YES completion:^{[timer invalidate];if(metadataObj.stringValue && [metadataObj.stringValue rangeOfString:@"http:"].location != NSNotFound){NSString *regex = @"http+:[^\\s]*";NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];// 正則表達式判斷 是否包含 http:if ([predicate evaluateWithObject:metadataObj.stringValue]){// 判斷是不是我們自己的二維碼if ([metadataObj.stringValue rangeOfString:@"http://m.pinlehuo.com/api.php"].location != NSNotFound) {NSLog(@"-------%@", metadataObj.stringValue);}else{[[UIApplication sharedApplication]openURL:[NSURL URLWithString:metadataObj.stringValue]];}}} else {NSLog(@"symbol.data = %@", metadataObj.stringValue);}}]; } }@end

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